When does memory release occur for an object in managed programming languages?

In managed programming languages such as Swift or Objective-C for iOS, memory is automatically managed using a memory management mechanism, for example, ARC (Automatic Reference Counting).

An object is released when there are no more strong references to it. As soon as the reference count of the object becomes zero, the memory occupied by the object is freed.

Example in Swift:

class MyClass {}

var obj: MyClass? = MyClass() // reference count = 1
obj = nil // reference count = 0, object is released

Thus, memory is freed when the object is no longer accessible from the code and there are no strong references to it.